function photo(filename)
  {
    document.javaPhoto.src = 'images/gallery/lo-res/' + filename;
    
    if(typeof(window.pageYOffset) == 'number')
      {
        scroll_y = window.pageYOffset;
        scroll_x = window.pageXOffset;
        window_y = window.innerHeight;
        window_x = window.innerWidth;
      }
    else
      {
        scroll_y = document.documentElement.scrollTop;
        scroll_x = document.documentElement.scrollLeft;
        window_y = document.documentElement.clientHeight;
        window_x = document.documentElement.clientWidth;
      }
    // fixed position so eliminate scroll offsets
    scroll_y = 0;
    scroll_x = 0;

    document.getElementById('photo').style.top = scroll_y + (window_y / 2) - 200 + "px";
    document.getElementById('photo').style.left = scroll_x + (window_x / 2) - 225 + "px";
    document.getElementById('image').style.top = scroll_y + (window_y / 2) - 200 + "px";
    document.getElementById('image').style.left = scroll_x + (window_x / 2) - 225 + "px";
    document.getElementById('photo-nav').style.top = scroll_y + (window_y / 2) - 200 + "px";
    document.getElementById('photo-nav').style.left = scroll_x + (window_x / 2) - 225 + "px";
    document.getElementById('photo').style.position = 'fixed';
    document.getElementById('image').style.position = 'fixed';
    document.getElementById('photo-nav').style.position = 'fixed';
    
    document.getElementById('photo').style.visibility = 'visible';
    document.getElementById('image').style.visibility = 'visible';
    document.getElementById('photo-nav').style.visibility = 'visible';
  }
function close_photo()
  {
    document.javaPhoto.src = 'images/blank_image.png';
    document.getElementById('photo').style.visibility = 'hidden';
    document.getElementById('image').style.visibility = 'hidden';
    document.getElementById('photo-nav').style.visibility = 'hidden';
    document.getElementById('photo').style.position = 'absolute';
    document.getElementById('image').style.position = 'absolute';
    document.getElementById('photo-nav').style.position = 'absolute';
  }